Pipe leaking behind shower..help!

Last night I discovered 2 small leaks in 2 spots behind our shower. I'm definitely don't possess any strong plumbing skills and just wanted your opinion on if this is an extremely easy fix that anyone could do or should I stick with calling someone out? Thanks

Thanks for the reply! It's a tub/shower combo so I don't think I could have the single valve could I? I'm lost with anything to do with plumbing so be patient with me haha. By riser you're referring to the copper pipe that goes up to the actual shower head right? Would it be as easy as just unscrewing the long copper pipe and replacing it with a new one?